"A boycott is an act of nonviolent, voluntary abstention from a product, person, organization, or country as an expression of protest. It is usually for moral, social, political, or environmental reasons. The purpose of a boycott is to inflict some economic loss on the target, or to indicate a moral outrage, usually to try to compel the target to alter an objectionable behavior."

This is what I was taught, but if there's a better word I'd love to be informed.